A debugging device for an electric sewage discharge valve in a power plant

Abstract

The present invention discloses a debugging device for an electric sewage valve in a power plant, comprising: a main power supply circuit, a valve opening control circuit, a valve closing control circuit, and an electrical stroke interface; the valve opening control circuit is connected to the opening stroke switch of the valve to be tested via a first input end of the electrical stroke signal interface; when the valve opening mechanical stroke switch of the valve to be tested is opened to a fully open position, the first non-self-locking switch is closed, the valve opening control circuit is conducted, and the valve to be tested performs a valve opening operation; the valve closing control circuit is connected to the closing stroke switch of the valve to be tested via a second input end of the electrical stroke signal interface; when the valve closing mechanical stroke switch of the valve to be tested is closed to a fully closed position, the second non-self-locking switch is closed, the valve closing control circuit is conducted, and the valve to be tested performs a valve opening operation. By implementing the present invention, the mechanical stroke and electrical stroke debugging of the electric sewage valve in a power plant can be completed simultaneously under offline conditions, thereby improving the safety of the valve debugging process.

Description

Technical Field

[0001] The invention relates to the field of cooling water source auxiliary systems of power plants, and in particular to a debugging device for an electric sewage valve of a power plant. Background Art

[0002] The circulating water filtration system of a power plant is an important cooling auxiliary system of the power plant and is also a related system for the safe operation of a power plant. The electric drain valve of the circulating water backwash filter of the power plant is an important component of it, and its operating status has a significant impact on the normal operation of the cooling water system of the power plant.

[0003] Currently, this type of valve primarily consists of a ball valve body and an electric actuator. Commissioning is typically conducted in two phases: the first involves mechanical stroke commissioning and a leak test of the valve body. The second phase involves installing the valve into the system piping and then conducting online commissioning of the electric actuator's electrical stroke. These two commissioning phases are performed by technicians with different expertise. This often leads to misalignment between the electrical and mechanical strokes, resulting in poor valve closure and internal leakage. This was previously reported by a domestic power plant, where multiple units experienced internal valve leakage that went undetected due to this issue. Furthermore, online commissioning of the electric actuator requires control from the operating electrical system. Any commissioning errors can cause abnormalities such as unit master control alarms and switchboard tripping, impacting the normal operation of other equipment. Furthermore, the power plant's circulating water filtration system is tightly packed, with adjacent equipment often appearing similar in appearance. The machine room environment is also hot and stuffy, creating a risk of electric shock for personnel who might misplace a compartment during installation and commissioning. Summary of the Invention

[0004] The present invention provides a debugging device for an electric blowdown valve in a power plant. By means of the device, the mechanical stroke and electrical stroke debugging of the electric blowdown valve of a backwash filter in a circulating water system of a power plant can be completed simultaneously under offline conditions, thereby improving the safety of the valve debugging process.

[0005] In order to solve the above technical problems, an embodiment of the present invention provides a debugging device for an electric sewage valve in a power plant, comprising: a main power supply circuit, a valve opening control circuit, a valve closing control circuit, and an electrical stroke interface;

[0006] The main power supply circuit includes: a power input interface, a power input interface of the electric valve to be tested, a normally open contact of the first contactor, a normally open contact of the second contactor, a transformer and a DC power supply module;

[0007] The control valve opening circuit includes: a first non-self-locking switch, a normally open contact of a first relay, a normally closed contact of a second contactor, a first contactor, and a first relay;

[0008] The control valve closing circuit includes: a second non-self-locking switch, a normally open contact of a second relay, a normally closed contact of a first contactor, a second contactor, and a second relay;

[0009] The external debugging power supply is connected to the primary winding of the transformer, the normally open contact of the first contactor, and the normally open contact of the second contactor through the power input interface; the normally open contact of the first contactor and the normally open contact of the second contactor are also connected to the power input interface of the electric valve to be tested; the current input end of the DC power supply module is connected to the secondary winding of the transformer, the current positive output end of the DC power supply module is connected to the first end of the first non-self-locking switch, the first end of the normally open contact of the first relay, the first end of the second non-self-locking switch, and the first end of the normally open contact of the second relay, and the current negative output end is connected to the output end of the electrical stroke signal interface;

[0010] The first end of the normally closed contact of the second contactor is connected to the second end of the first non-self-locking switch and the second end of the normally open contact of the first relay, the second end of the normally closed contact of the second contactor is connected to the first end of the first contactor and the first end of the first relay, and the second end of the first contactor and the second end of the first relay are both connected to the open travel switch of the electric valve to be tested through the first input end of the electrical travel signal interface;

[0011] The first end of the normally closed contact of the first contactor is connected to the second end of the second non-self-locking switch and the second end of the normally open contact of the second relay, the second end of the normally closed contact of the first contactor is connected to the first end of the second contactor and the first end of the second relay, and the second end of the second contactor and the second end of the second relay are both connected to the closing travel switch of the electric valve to be tested through the second input end of the electrical travel signal interface;

[0012] When the valve opening mechanical travel switch of the electric valve to be tested is opened to the fully open position, the first non-self-locking switch is closed;

[0013] When the valve closing mechanical travel switch of the electric valve to be tested is closed to the fully closed position, the second non-self-locking switch is closed.

[0014] As a preferred solution, the debugging device for the electric sewage valve of the power plant further includes: a valve state indication circuit and a valve state signal interface;

[0015] The valve status indication circuit includes: a valve open position indicator light;

[0016] The first end of the valve open position indicator light is connected to the positive current output end of the DC power supply module, and the second end of the valve open position indicator light is connected to the valve full-open state feedback switch of the electric valve to be tested through the first input end of the valve state signal interface.

[0017] As a preferred solution, the valve status indication circuit further includes: a valve closed position indicator light;

[0018] The first end of the valve closed position indicator light is connected to the positive current output end of the DC power supply module, and the second end of the valve closed position indicator light is connected to the valve fully closed state feedback switch of the electric valve to be tested through the second input end of the valve state signal interface.

[0019] As a preferred solution, the debugging device for the electric sewage valve of the power plant further includes: an emergency stop switch;

[0020] The positive current output end of the DC power supply module is connected to the first end of the first non-self-locking switch, the first end of the normally open contact of the first relay, the first end of the second non-self-locking switch, the first end of the normally open contact of the second relay, the first end of the valve open position indicator light, and the first end of the valve closed position indicator light through the emergency stop switch.

[0021] As a preferred solution, the normally open contact of the first contactor and the normally open contact of the second contactor are connected to the power input interface of the electric valve to be tested through the following wiring method:

[0022] The normally open contact of the first contactor is connected to the power input interface of the electric valve to be tested through a positive phase sequence wiring method, and the normally open contact of the second contactor is connected to the power input interface of the electric valve to be tested through a negative phase sequence wiring method.

[0023] Compared with the prior art, the embodiments of the present invention have the following beneficial effects:

[0024] In an embodiment of the present invention, when the valve opening debugging of the electric valve to be tested is performed, when the valve opening mechanical stroke switch of the electric valve to be tested is opened to the fully open position, the first non-self-locking switch is closed, and the electrical stroke switch inside the valve to be tested is also opened to the fully open position: the first non-self-locking switch is closed, and the valve opening control circuit is connected through the first non-self-locking switch, the normally closed contact of the second contactor, the first contactor, the first relay, the first input end of the electrical stroke signal interface, the electrical stroke switch of the electric actuator of the electric valve to be tested, and the output end of the electrical stroke signal interface to form a conductive circuit, so that the coils of the first contactor and the first relay are energized, the normally open contact of the first contactor is closed and conductive, the normally closed contact is opened, and the normally open contact of the first relay is closed and conductive. At this time, in the main power supply circuit, the external debugging power supply is connected to the power input interface, the normally open contact of the first contactor, the power input interface of the electric valve to be tested, and the motor of the electric actuator of the electric valve to be tested to form a conductive circuit, so that the electric actuator of the electric valve to be tested performs the valve opening action. After the first non-self-locking switch is closed and opened once, the normally open contact of the first relay closes, maintaining the valve opening control circuit in a conductive state. When the valve reaches the fully open state, the electrical travel switch of the electric valve under test opens, the first contactor and the first relay coil lose power and reset, and the valve actuator stops opening the valve, completing the electrical travel for opening the valve. The same process applies to closing the valve. Compared to the prior art, the embodiments of the present invention perform simultaneous debugging of the valve's electrical and mechanical travel, ensuring that the electrical and mechanical travel for closing the valve are consistent, thereby improving safety during valve debugging. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a structural schematic diagram of a debugging device for an electric sewage valve in a power plant provided by one embodiment of the present invention;

[0026] Figure 2 The diagram is a complete structural diagram of a debugging device for an electric sewage valve in a power plant provided by one embodiment of the present invention. DETAILED DESCRIPTION

[0027] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0028] Example 1

[0029] Please refer to Figure 1, which is a schematic structural diagram of a debugging device for an electric sewage valve in a power plant provided by an embodiment of the present invention, comprising: a main power supply circuit, a valve opening control circuit, a valve closing control circuit, and an electrical stroke interface;

[0030] The main power supply circuit includes: a power input interface, a power input interface of the electric valve to be tested, a normally open contact of the first contactor, a normally open contact of the second contactor, a transformer and a DC power supply module;

[0031] The control valve opening circuit includes: a first non-self-locking switch, a normally open contact of a first relay, a normally closed contact of a second contactor, a first contactor, and a first relay;

[0032] The control valve closing circuit includes: a second non-self-locking switch, a normally open contact of a second relay, a normally closed contact of a first contactor, a second contactor, and a second relay;

[0033] The external debugging power supply is connected to the primary winding of the transformer, the normally open contact of the first contactor, and the normally open contact of the second contactor through the power input interface; the normally open contact of the first contactor and the normally open contact of the second contactor are also connected to the power input interface of the electric valve to be tested; the current input end of the DC power supply module is connected to the secondary winding of the transformer, the current positive output end of the DC power supply module is connected to the first end of the first non-self-locking switch, the first end of the normally open contact of the first relay, the first end of the second non-self-locking switch, and the first end of the normally open contact of the second relay, and the current negative output end is connected to the output end of the electrical stroke signal interface;

[0034] The first end of the normally closed contact of the second contactor is connected to the second end of the first non-self-locking switch and the second end of the normally open contact of the first relay, the second end of the normally closed contact of the second contactor is connected to the first end of the first contactor and the first end of the first relay, and the second end of the first contactor and the second end of the first relay are both connected to the open travel switch of the electric valve to be tested through the first input end of the electrical travel signal interface;

[0035] The first end of the normally closed contact of the first contactor is connected to the second end of the second non-self-locking switch and the second end of the normally open contact of the second relay, the second end of the normally closed contact of the first contactor is connected to the first end of the second contactor and the first end of the second relay, and the second end of the second contactor and the second end of the second relay are both connected to the closing travel switch of the electric valve to be tested through the second input end of the electrical travel signal interface;

[0036] When the valve opening mechanical travel switch of the electric valve to be tested is opened to the fully open position, the first non-self-locking switch is closed;

[0037] When the valve closing mechanical travel switch of the electric valve to be tested is closed to the fully closed position, the second non-self-locking switch is closed.

[0038] In the shown Figure 1 In the test, the main power supply circuit includes: power input interface 1, power input interface 2 of the electric valve to be tested, normally open contact 001UJ-1 of the first contactor, normally open contact 002UJ-1 of the second contactor, transformer 3 and DC power supply module 4;

[0039] The control valve opening circuit includes: a first non-self-locking switch 5, a normally open contact 001UM-1 of a first relay, a normally closed contact 002UJ-2 of a second contactor, a first contactor 001UJ and a first relay 001UM;

[0040] The valve closing control circuit includes: a second non-self-locking switch 6, a normally open contact 002UM-1 of a second relay, a normally closed contact 001UJ-2 of a first contactor, a second contactor 002UJ and a second relay 002UM;

[0041] exist Figure 1 In the figure, the circuit part in the dotted box is the internal circuit of the valve electric actuator of the electric valve to be tested, and SM1-1 and SM1-2 in the circuit in the dotted box are electrical travel switches inside the valve, among which SM1-1 is the open travel switch, which is disconnected when the electric valve to be tested reaches the fully open travel, and the switch is connected when the electric valve to be tested reaches the fully closed travel; SM1-2 is the close travel switch, which is disconnected when the electric valve to be tested reaches the fully closed travel, and the switch is connected when the electric valve to be tested reaches the fully open travel.

[0042] The control valve opening circuit is connected to the open stroke switch SM1-1 of the internal circuit of the electric valve to be tested through the first input end (terminal 1) of the electrical stroke interface 7, and the control valve closing circuit is connected to the close stroke switch SM1-2 of the internal circuit of the electric valve to be tested through the second input end (terminal 2) of the electrical stroke interface 7; the power input interface 2 of the electric valve to be tested of the main power circuit is connected to the motor of the valve electric actuator of the electric valve to be tested. When the main power circuit and the control valve opening circuit are simultaneously connected, the valve electric actuator of the electric valve to be tested performs the valve opening action. When the valve is fully opened, the valve open stroke switch SM1-1 is disconnected and the close stroke switch SM1-2 is closed. Similarly, when the main power circuit and the control valve closing circuit are simultaneously connected, the valve electric actuator of the electric valve to be tested performs the valve closing action. When the valve is fully closed, the valve close stroke switch SM1-2 is disconnected and the open stroke switch SM1-1 is closed.

[0043] Preferably, the debugging device of the electric sewage valve of the power plant also includes: a valve status indication circuit and a valve status signal interface; the valve status indication circuit includes: a valve open position indicator light; the first end of the valve open position indicator light is connected to the positive current output end of the DC power supply module, and the second end of the valve open position indicator light is connected to the valve fully open state feedback switch of the electric valve to be tested through the first input end of the valve status signal interface.

[0044] Please refer to Figure 2 , which is a complete structural diagram of a debugging device for an electric sewage valve in a power plant provided by an embodiment of the present invention. The device also includes a valve status indication circuit and a valve status signal interface. The valve status indication circuit includes a valve open position indicator light 8. The valve open position indicator light 8 is connected to the valve fully open state feedback switch SM2-1 of the electric valve to be tested through the first input end of the valve status signal interface.

[0045] Preferably, the valve status indication circuit further includes: a valve closed position indicator light; the first end of the valve closed position indicator light is connected to the positive current output end of the DC power supply module, and the second end of the valve closed position indicator light is connected to the valve fully closed state feedback switch of the electric valve to be tested through the second input end of the valve status signal interface.

[0046] exist Figure 2 In the figure, the internal circuit of the valve electric actuator within the dotted box also includes: a valve fully open state feedback switch SM2-1 and a valve fully open state feedback switch SM2-2; the valve state indication circuit also includes a valve closed position indicator light 9, and the valve closed position indicator light 9 is connected to the valve fully closed state feedback switch SM2-2 of the electric valve to be tested through the second input end of the valve state signal interface.

[0047] The signals output by the SM2-1 and SM2-2 travel switches are fed back to the system to indicate whether the valve is in the fully open or fully closed state. SM2-1 is the valve fully open state feedback switch. When the valve reaches the fully open stroke, the switch is turned on, and when it reaches the fully closed stroke, the switch is turned off. SM2-2 is the valve fully closed state feedback switch. When the valve reaches the fully open stroke, the switch is turned off, and when it reaches the fully closed stroke, the switch is turned on.

[0048] Preferably, the debugging device of the electric sewage valve of the power plant also includes: an emergency stop switch; the positive current output end of the DC power supply module is connected to the first end of the first non-self-locking switch, the first end of the normally open contact of the first relay, the first end of the second non-self-locking switch, the first end of the normally open contact of the second relay, the first end of the valve open position indicator light and the first end of the valve closed position indicator light through the emergency stop switch.

[0049] exist Figure 2In the embodiment, the device further includes an emergency stop switch 11. The positive current output terminal of the DC power supply module is connected to the valve opening control circuit, the valve closing control circuit and the valve status indication circuit through the emergency stop switch 11. The emergency stop switch 11 is a normally closed contact and is used to ensure safety during the valve debugging process.

[0050] Preferably, the normally open contact of the first contactor and the normally open contact of the second contactor are connected to the power input interface of the electric valve to be tested through the following wiring method: the normally open contact of the first contactor is connected to the power input interface of the electric valve to be tested through a positive phase sequence wiring method, and the normally open contact of the second contactor is connected to the power input interface of the electric valve to be tested through a negative phase sequence wiring method.

[0051] exist Figure 2 In the example, the normally open contact 001UJ of the first contactor is connected to the power input interface 2 of the electric valve under test via a positive phase sequence wiring method. The power input interface 2 of the electric valve under test is connected to the motor of the electric valve under test. When the main power circuit and the control valve opening circuit are simultaneously conductive, the valve electric actuator of the electric valve under test operates to open the valve. The normally open contact 002UJ of the second contactor is connected to the power input interface 2 of the electric valve under test via a negative phase sequence wiring method. When the main power circuit and the control valve closing circuit are simultaneously conductive, the valve electric actuator of the electric valve under test operates to close the valve. That is, the normally open contact 002UJ of the second contactor changes the phase sequence of the three-phase AC power supply through a different wiring sequence than the normally open contact 001UJ of the first contactor, causing the motor of the valve electric actuator to rotate in the opposite direction of the valve opening, and the valve to operate to close the valve.

[0052] In the debugging device, the electrical stroke signal interface 7, the valve status signal interface 10, the valve open position indicator light 8, the valve closed position indicator light 9, the first non-self-locking switch 5, the second non-self-locking switch 6, and the emergency stop switch 11 are all installed on the upper operation panel of the debugging device casing, the power input interface 1 and the power input interface 2 of the electric valve to be tested are installed on the side of the box, and the first contactor 001UJ, the second contactor 002UJ, the first relay 001UM, the second relay 002UM, the transformer 3, and the DC power supply module 4 are all installed inside the debugging device casing.

[0053] The process of using the device to perform electrical stroke debugging on the electric valve to be tested is as follows:

[0054] S1, the electrical stroke signal interface 7 of the debugging device is connected to the electrical stroke contact of the electric actuator of the electric valve under test via an electrical stroke signal cable. The valve status signal interface 10 of the debugging device is connected to the status signal contact of the electric actuator of the electric valve under test via the valve status signal cable. The power input interface 2 of the debugging device for the electric valve under test is connected to the motor of the electric actuator of the electric valve under test via the electric valve power output cable.

[0055] S2. The power input interface 1 of the debugging device is connected to the external debugging power supply via the power input cable of the debugging device.

[0056] At this time, the external three-phase AC power supply is connected to the L1, L2, and L3 terminals of the power input interface 1 of the debugging device through the power input cable of the debugging device, and inputs three-phase AC power to the main power circuit of the debugging device. At the same time, the DC voltage "24V+" is output to the emergency stop switch 11 through the transformer 3 and the DC power supply module 4, and the DC voltage "24V-" is output to the output end (terminal 3) of the electrical stroke signal interface 7 and the output end 3 terminal of the valve status signal interface 10 to power the control circuit and valve status indication circuit of the debugging device.

[0057] S3. When the valve opening mechanical travel switch of the electric valve to be tested is opened to the fully open position, the first non-self-locking switch is closed.

[0058] At this point, the control valve opening circuit of the debugging device forms a conductive circuit through the emergency stop switch 11, the first non-self-locking switch 5, the normally closed contact 002UJ-2 of the second contactor, the first contactor 001UJ, the first relay 001UM, the first input terminal (terminal 1) of the electrical stroke signal interface 7, the open stroke switch SM1-1 of the electrical actuator of the electric valve to be tested, and the output terminal (terminal 3) of the electrical stroke signal interface 7. When the coils of the first contactor 001UJ and the first relay 001UM are energized, the normally open contact 001UJ-1 of the first contactor closes and conducts, the normally closed contact 001UJ-2 opens, and the normally open contact 001UM-1 of the first relay closes and conducts. At this time, in the main power supply circuit, the external debugging power supply forms a conducting circuit with the motor of the electric actuator of the electric valve to be tested through the power input cable of the debugging device, the power input interface 1 of the debugging device, the normally open contact 001UJ-1 of the first contactor, the power input interface 2 of the electric valve to be tested, the power output cable of the electric valve, and the motor of the electric actuator of the electric valve to be tested, so that the electric actuator of the electric valve to be tested performs the valve opening action.

[0059] In the control valve opening circuit, the normally open contact 001UM-1 of the first relay is connected in parallel with the first non-self-locking switch 5. After the first non-self-locking switch 5 is closed once and disconnected, the normally open contact 001UM-1 of the first relay is closed, so that the control valve opening circuit remains in the conductive state. This function is called "self-locking hold" in electrical technology.

[0060] In the valve closing control circuit, since the coil of the first contactor 001UJ is energized, the normally closed contact 001UJ-2 of the first contactor is disconnected, cutting off the valve closing control circuit so that it cannot form a conductive circuit. This prevents the operator from mistakenly operating the second non-self-locking switch 6 at this time, causing the second contactor 002UJ to be energized and the normally open contact 002UJ-1 of the second contactor to be closed at the same time, thereby causing a short circuit fault in the main power supply circuit of the debugging device. This function is called "electrical interlocking" in electrical technology.

[0061] When the valve reaches its fully open position, the open travel switch SM1-1 of the electric valve under test is disconnected, the coils of the first contactor 001UJ and the first relay 001UM lose power and reset, and the electric valve actuator stops opening the valve, completing the electrical travel of the valve opening. At this point, in the valve indication circuit, a conductive circuit is formed through the emergency stop switch 11, the valve open position indicator light 8, the first input terminal (terminal 1) of the valve status signal interface 10, the fully open state feedback switch SM2-1 of the electric valve under test, and the output terminal (terminal 3) of the valve status signal interface 10. The valve open position indicator light 8 illuminates, and the valve closed position indicator light 9 goes out. The electric valve under test is then checked to see if it has reached its fully open position. This confirms that the electrical travel of the electric valve under test is consistent with its mechanical travel, and that the debugging of the open travel switch SM1-1, the fully open state feedback switch SM2-1, and the mechanical travel of the valve opening are complete. If the valve is not found to be in the fully open position, step S3 is re-executed.

[0062] S4. When the valve closing mechanical travel switch of the electric valve to be tested is closed to the fully closed position, the second non-self-locking switch is closed.

[0063] This step is when the electric actuator of the electric valve to be tested is operating to close the valve. Similar to the valve opening step, the control valve closing circuit of the debugging device forms a conductive circuit through the emergency stop switch 11, the second non-self-locking switch 6, the normally closed contact 001UJ-2 of the first contactor, the second contactor 002UJ, the second relay 002UM, the second input end (terminal 2) of the electrical stroke signal interface 7, the closing stroke switch SM1-2 of the electric actuator of the electric valve to be tested, and the output end (terminal 3) of the electrical stroke signal interface 7. The coils of the second contactor 002UJ and the second relay 002UM are energized, the normally open contact 002UJ-1 of the second contactor is closed and conductive, the normally closed contact 002UJ-2 is opened, and the normally open contact 002UM-1 of the second relay is closed and conductive. At this time, in the main power supply circuit, the external debugging power supply forms a conducting circuit with the motor of the electric actuator of the electric valve to be tested through the power input cable of the debugging device, the power input interface 1 of the debugging device, the normally open contact 002UJ-1 of the second contactor, the power input interface 2 of the electric valve to be tested, the power output cable of the electric valve, and the motor of the electric actuator of the electric valve to be tested, so that the electric actuator of the electric valve to be tested performs the valve closing action.

[0064] Similarly, in the control valve closing circuit, the normally open contact 0021UM-1 of the second relay is connected in parallel with the second non-self-locking switch 6. After the second non-self-locking switch 6 is closed once and disconnected, the normally open contact 002UM-1 of the second relay is closed, so that the control valve closing circuit remains in the on state. This function is called "self-locking hold" in electrical technology.

[0065] Similarly, in the control valve opening circuit, because the coil of the second contactor 002UJ is energized, the normally closed contact 002UJ-2 of the second contactor is disconnected, cutting off the control valve opening circuit so that it cannot form a conductive circuit, thereby preventing the operator from misoperating the first non-self-locking switch 5 at this time, causing the first contactor 001UJ to be energized and the normally open contact 001UJ-1 of the first contactor to be closed at the same time, thereby causing a short circuit fault in the main power supply circuit of the debugging device. This function is called "electrical interlocking" in electrical technology.

[0066] When the valve reaches its fully closed state, the valve's closing travel switch SM1-2 is disconnected, the coils of the second contactor 002UJ and the second relay 002UM are de-energized and reset, and the valve actuator stops closing the valve, completing the valve's electrical closing travel. At this point, the valve indicator circuit, consisting of the emergency stop switch 11, the valve closed position indicator light 9, the second input terminal (terminal 2) of the valve status signal interface 10, the fully open state feedback switch SM2-2 of the electric valve under test, and the output terminal (terminal 3) of the valve status signal interface 10, forms a conductive loop. The valve closed position indicator light 9 illuminates, while the valve open / close position indicator light 8 turns off.

[0067] After executing the above steps S1-S4, the electrical stroke debugging process of the electric valve to be tested is completed. At this point, the valve to be tested can also be subjected to an offline sealing test to confirm whether the valve to be tested is tightly closed and has no internal leakage. If the test results meet the system's requirements for valve sealing, it can be confirmed that the valve to be tested is fully closed, the electrical stroke for closing the valve is consistent with the mechanical stroke for closing the valve, and the debugging of the electrical stroke switch and the mechanical stroke for closing the valve is complete. If it is found during the execution of this step that the valve has internal leakage due to loose closure, the above steps S1-S4 are re-executed until the test results of the sealing test meet the system's requirements for valve sealing. All connections between the debugging device, the valve to be tested, and the external debugging power supply are removed to complete the offline debugging of the valve to be tested.

[0068] As can be seen from the above, the present invention provides a tunnel wind pressure detection device, through which the electrical stroke and mechanical stroke of the valve can be debugged simultaneously, so that the electrical stroke of closing the valve and the mechanical stroke of closing the valve can be consistent, thereby improving the safety of the valve debugging process.

[0069] The specific embodiments described above further illustrate the objectives, technical solutions, and beneficial effects of the present invention. It should be understood that the above descriptions are merely specific embodiments of the present invention and are not intended to limit the scope of protection of the present invention. In particular, it should be noted that any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included within the scope of protection of the present invention for those skilled in the art.

Claims

1. A debugging device for an electric drain valve in a power plant, characterized in that: include: Main power supply circuit, valve opening control circuit, valve closing control circuit and electrical stroke signal interface; The main power supply circuit includes: a power input interface, a power input interface of the electric valve to be tested, a normally open contact of the first contactor, a normally open contact of the second contactor, a transformer and a DC power supply module; The control valve opening circuit includes: a first non-self-locking switch, a normally open contact of a first relay, a normally closed contact of a second contactor, a first contactor, and a first relay; The control valve closing circuit includes: a second non-self-locking switch, a normally open contact of a second relay, a normally closed contact of a first contactor, a second contactor, and a second relay; The external debugging power supply is connected to the primary winding of the transformer, the normally open contact of the first contactor, and the normally open contact of the second contactor through the power input interface; the normally open contact of the first contactor and the normally open contact of the second contactor are also connected to the power input interface of the electric valve to be tested; the current input end of the DC power supply module is connected to the secondary winding of the transformer, the current positive output end of the DC power supply module is connected to the first end of the first non-self-locking switch, the first end of the normally open contact of the first relay, the first end of the second non-self-locking switch, and the first end of the normally open contact of the second relay, and the current negative output end is connected to the output end of the electrical stroke signal interface; The first end of the normally closed contact of the second contactor is connected to the second end of the first non-self-locking switch and the second end of the normally open contact of the first relay, the second end of the normally closed contact of the second contactor is connected to the first end of the first contactor and the first end of the first relay, and the second end of the first contactor and the second end of the first relay are both connected to the open travel switch of the electric valve to be tested through the first input end of the electrical travel signal interface; The first end of the normally closed contact of the first contactor is connected to the second end of the second non-self-locking switch and the second end of the normally open contact of the second relay, the second end of the normally closed contact of the first contactor is connected to the first end of the second contactor and the first end of the second relay, and the second end of the second contactor and the second end of the second relay are both connected to the closing travel switch of the electric valve to be tested through the second input end of the electrical travel signal interface; When the valve opening mechanical travel switch of the electric valve to be tested is opened to the fully open position, the first non-self-locking switch is closed; When the valve closing mechanical travel switch of the electric valve to be tested is closed to the fully closed position, the second non-self-locking switch is closed.

2. The debugging device for the electric drain valve of a power plant according to claim 1, characterized in that: It also includes: a valve status indication circuit and a valve status signal interface; The valve status indication circuit includes: a valve open position indicator light; The first end of the valve open position indicator light is connected to the positive current output end of the DC power supply module, and the second end of the valve open position indicator light is connected to the valve full-open state feedback switch of the electric valve to be tested through the first input end of the valve state signal interface.

3. The debugging device for the electric drain valve of a power plant according to claim 2, characterized in that: The valve status indication circuit further includes: a valve closed position indicator light; The first end of the valve closed position indicator light is connected to the positive current output end of the DC power supply module, and the second end of the valve closed position indicator light is connected to the valve fully closed state feedback switch of the electric valve to be tested through the second input end of the valve state signal interface.

4. The debugging device for the electric drain valve of a power plant according to claim 3, characterized in that: Also includes: Emergency stop switch; The positive current output end of the DC power supply module is connected to the first end of the first non-self-locking switch, the first end of the normally open contact of the first relay, the first end of the second non-self-locking switch, the first end of the normally open contact of the second relay, the first end of the valve open position indicator light, and the first end of the valve closed position indicator light through the emergency stop switch.

5. The debugging device for the electric drain valve of a power plant according to claim 1, characterized in that: The normally open contact of the first contactor and the normally open contact of the second contactor are connected to the power input interface of the electric valve to be tested through the following wiring method: The normally open contact of the first contactor is connected to the power input interface of the electric valve to be tested through a positive phase sequence wiring method, and the normally open contact of the second contactor is connected to the power input interface of the electric valve to be tested through a negative phase sequence wiring method.

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